Diminished skin barrier is the essential factor that plays a role in the initiation, consolidating and exacerbating AD. The skin exposed to aeroallergens (pollen, pet dander, dust mites), or food allergens (eggs, milk, wheat protein, chocolate, strawberry), hard water, and soaps and detergents, loses the protective barrier composed of lipids (ie. Lipid) and becomes the victim of harmful, exogenous substances.